During incoming call from SIP trunk to AA, and when blind transfer to an internal extension, the caller not present with ringback tone. Are there any way to configure sending ringback tone during transfer?
A few things to try:
If you're running code older than 12.4(15)T, make sure your incoming voip leg doesn't have a 'codec class' on it.
In CUE, you can try changing this parameter to see different results:
ccn subsystem sip
transfer-mode blind bye-also (suggested
transfer-mode blind refer
See if you get different results with any of the transfer modes.
You may need to make sure you have this command:
voice service voip
no supplementary-service sip moved-temporarily
supplementary-service sip refer